It would have to be column per second cause cam sensor is most likely rolling shutter so the top of the frame would be detected later than the bottom but ideall

It would have to be column per second cause cam sensor is most likely rolling shutter so the top of the frame would be detected later than the bottom but ideally if you have a global shutter cam sensor you could do entire frames per second but I don’t think a global shutter 40k fps camera exists.